I've read somewhere that after a person has a heart transplant, it is possible that his/her attitude, action or behavior would change slightly or significantly, as though he/she possesses some aspects of the organ donor's personality because he/she is using the donor's heart.

Anything to support this phenomenon? Does it suggest that there are actually memories 'stored' in the heart and these memories may be retrieved by the person that owns the heart even if he/she is not the original owner?

2 Answers
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Although there is clearly no feasible mechanism for such a phenomenon, there is good evidence that transplant patients can believe in some sort of transference of qualities from the donor. See for example (my emphasis):

The goal of this study was to examine heart transplant recipients' psychological adaptation to another person's heart, with particular emphasis on recipients' attitudes toward graft and donor.
Thirty-five male heart recipients were examined by: the Symptom Distress Checklist (revised) (SCL-90-R); the Depression Adjective Checklist (DACL); a Post-Traumatic Stress Disorder Questionnaire (PTSD-Q); a Heart Image Questionnaire (HIQ); and a Semi-Structured Interview (SSI), aimed at eliciting attitudes and fantasies regarding the transplanted heart.
All instruments indicated high levels of stress even several years after the transplant, but, simultaneously, 73% of recipients felt that acquiring a new heart had had a dramatic influence on their lives with a new appreciation of the preciousness of life and a shift of priorities, toward altruism and spirituality. Sixty percent returned to work after the transplant but some had to adapt to a changed attitude from those around them who regarded them as anything from mystical creatures to vulnerable or still-sick individuals. While all recipients possessed a scientific knowledge of the anatomy and physiological significance of the heart (as revealed in the HIQ), many endorsed fantasies and displayed magical thinking: 46% of the recipients had fantasies about the donor's physical vigor and prowess, 40% expressed some guilt regarding the death of the donor, 34% entertained the possibility of acquiring qualities of the donor via the new heart. When asked to choose a most and least preferred imagined donor, 49% constructed their choices according to prejudices, desires, or fears related to ethnic, racial or sexual traits attributed to the donor.
This study confirms the intuitive idea that heart transplant involves a stressful course of events that produces an amplified sense of the precariousness of existence. Simultaneously, it gives rise to rejoicing at having been granted a new lease on life and a clear sense of new priorities, especially with regard to relationships. Less expectedly, this study shows that, despite sophisticated knowledge of anatomy and physiology, almost half the heart recipients had an overt or covert notion of potentially acquiring some of the donor's personality characteristics along with the heart. The concomitance of the magical and the logical is not uncommon in many areas of human existence, and is probably enhanced by the symbolic nature of the heart, and maybe, also, by the persistent stress that requires an ongoing, emotionally intense, adaptation process.

To actually investigate this further I suppose it would be necessary to set up experiments in which patients had transplant operations in which (unknown to the patient) no transplant actually took place, with the expectation that these individuals would display the same magical thinking. Grant application?

"To actually investigate this further I suppose it would be necessary to set up experiments in which patients had transplant operations in which (unknown to the patient) no transplant actually took place, with the expectation that these individuals would display the same magical thinking. Grant application?" ... Ha, yeah, I don't fancy the chances of getting past the ethics committee!
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rg255Jan 3 '13 at 12:12

Alternately, they could be lied to about who their donor "was" to see if they manifest the memories and feelings of a 22 year old woman when their donor was actually a 35 year old man. Though I'm pretty sure an IRB would clobber that too.
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FomiteJan 4 '13 at 2:01

There are neurons all over the body, not just in the brain. The area with the most neurons, beside the brain, is the heart. It's been theorized that some memory could reside in these cells. I'm a big believer that if you keep an open mind people will throw garbage in it, but this particular phenomena seems worthy of further study.